Strong-field response time and its implications on attosecond measurement

TL;DR

This paper discusses the response time of electrons in strong laser fields and its impact on attosecond measurements, highlighting recent findings on ionization time lag and its influence on ultrafast electron dynamics.

Contribution

It introduces recent research on electron response time in strong fields and its implications for improving attosecond measurement techniques.

Findings

Coulomb potential causes about 100 attoseconds ionization time lag.

Response time affects electron trajectory and ultrafast dynamics.

Implications for refining attosecond measurement methods.

Abstract

To measure and control the electron motion in atoms and molecules by the strong laser field on the attosecond time scale is one of the research frontiers of atomic and molecular photophysics. It involves many new phenomena and processes and raises a series of questions of concepts, theories and methods. Recent studies show that the Coulomb potential can cause the ionization time lag (about 100 attoseconds) between instants of the field maximum and the ionization-rate maximum. This lag can be understood as the response time of the electronic wave function to the strong-field-induced ionization event. It has a profound influence on the subsequent ultrafast dynamics of the ionized electron and can significantly change the time-frequency properties of electron trajectory (an important theoretical tool for attosecond measurement). Here, the research progress of response time and its implications on attosecond measurement are briefly introduced.